Tolerant input circuit
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United States of America Patent
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-
Mar 10, 2009
Grant Date -
Oct 5, 2006
app pub date -
Sep 27, 2005
filing date -
Mar 29, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A tolerant input circuit that functions stably regardless of fabrication differences without having to adjust the threshold value of an input circuit. The tolerant input circuit includes a step-down device configured by an N-channel MOS transistor connected between an input pad and the input circuit. Voltage from a power supply is supplied to the gate of the N-channel MOS transistor in the step-down device to decrease the voltage of a high voltage signal provided to the input pad to the voltage of the power supply or lower. The signal with decreased voltage is provided to the input circuit. The tolerant input circuit includes a back gate voltage control circuit for increasing back gate voltage of the N-channel MOS transistor in the step-down device when the input pad is provided with a high voltage signal.
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